Apparatus for use in administering gases, vapors, and the like



Feb.24, 1925. Y. 1,527,927

H. WrC. SCHRDER APPARATUS FOR USE IN ADMINISTERING GASES, VAPORS, ANDTHE LIKE FledJune 7, 1923 y,0 m n li-usw? /H/ vena?" Patented Feb. 24, 1925ia UNITED. STATES PATE y 1,521,9zr

NT OFFICE.

HANS WILHELM'CHEISTIAN SCHRDER, Vor LUBEcx.' GERMANY, AssIGNoE. 'ro ALEX- ANDER BERNHARD maliens.,y OEEINKENBEEG, LUBECK, GERMANY.

APPARATUS FOB USE IN ADMINISTERING GASES, VAPO'RS, AND THE LIKE.

t Application led June 7, 1923. Serial No. 644,915.

To ali 'whom t may concern.'

Be it knownthat I, HANS VILHELM CHRIS- TIAN SCHRDER, a German citizen, residing at Lubeck, Germany, have invented certain new and useful Improvements in Apparatus for` Use in Administering Gases. v apors, andthe like, of which the following 1s a specification.

use in administering gases, vapors,l and the like, particularly in simultaneously administering two or more different gases &c.

It is well known that, for certainmedical purposes, such for instance as adminstering aneesthetics, a mixture of gases or vapors has to be breathed in or inhaled. According to thel conditions prevailing, a greater or lesser quantity of gas must be conveyed to the patient according to breathing requirements, and the combination of gases must also be made in accordance with a predetermined percentage 'of composition so as to obtain a certain definite effect. The regulation of the quantity of gas needed and the alteration of the proportions ofrthe Amixture must be effected easily and in a reliable manner. I

According to this-invention an apparat is provided by means of which the requirements aforesaid are met.

Referring to the accompanying drawing which shows a preferred embodiment of the A invention:

, 3 3, Fig. 2;

Fig. 1 is a view, in perspective, of the f assembled apparatus;

Fig.,2 isa view, partly in elevation and partly in section, of the double slide valve for effecting the mixture of the gases;

' Fig. 3 is a horizontal section on theline Fi 4 isa view, onan enlarged scaleof the ial of one of the regulating gauges.'

In carrying the invention into e'ect two different gases having therapeutic or anaesthetic properties, which, for convenience are designated A and B, are as shown in Figure 1 of the drawings as contained, respectivel in a compressedstate in a pair of steel cy inders of well known form. In order tol re.- duee the high pressures of the gases A and lB to proper working pressures, pressure reducing valves a and b are provided. At the valve a the pressure is adjusted by means of the regulating screw c according to the gauge (Z, and at the valve b by means of the regulating screw e according t0 the gauge.

This invention relates to apparatus for f. Conduits g and h (e. g. metal or rubber pipes).conduct the gases A and B to a double slide valve z' in which the two gases are mixcdand the nuxture, upon leaving the The double slide valve, which is shown asy being arranged to rotate, consists of the stationary casing m having gas feed passages n and o, opening on to a' slidingsurface, and a mixing cap p. This latterl is rotatable and contacts 1n a gas-tight manner with the surface of the casing m. From the mixlng or collecting chamber of the cap p single conduits or passages g and 1' of varying width lead to the contacting surfaces of the cap p. and casing m, and are so arrenged that, upon rotation of the cap, they cover up or open the apertures n and a to the same extent. The different positions of the mixing cap, visible acording to a scalegf--i-r4 as shown in Fi ure 1, accordin lyv entail the transmission o larger or smal er quantities `of uniform mixture of both gases per unit of time.' These quantities are intended to coincide with the breathing requirements of the patient and may vary-from 5 to 25 litres per minute. Instead of the slide valve a double tapnor the like may be used. In relationship with the cross sectional areas adjusted upon the slide valve the gas preures are adjusted by means of the gauges d and By regulation of the gas pressure, the ratio of, both gases. to the total amount of the mixture can be regulated and, referably, the gauge is so graduated that t `e ercentage of the contents can be read o once. I f thefquantite's ofthe mixture to be inhaled vary greatly, say between 5 to 25 litres per minute, then in view of the variations in the amount of friction set up in the conduits in the slide valve according to adjustments of the latter, several scales must be provided on the gauges. In this way accurate valuesfare obtained within definite gas B is, on, the contrary, so adjusted by means of the regulating screw c that the instages of quantity, for instance of 0-5, 5-10, A 10-15 litres and so on. .If the mixture of gas at 5 litres total quantity,for example, is to-` Cil dicator of the gauge f points to the graduation S0 on the section of the scale for 5 litres.

If required, an alteration in the quantity can easily be e'ected by means of a short movement on the slide valve. An alteration in the mixing proportion does not, as a rule, require 4to be made suddenly, so that the regulation at the valves a and Z) can be made one after the other. For more rapid regulation, eccentrics or similar devices adapted to effect a quick adjustment may, of course, be provided in place of the regulating screws c and e. Furthermore, the regulating members can be so interconnected that, by a single operation, on one side a rise, and on the other side a fall, Will occur in the pressure (not shown in the drawing). At 50%, that is with equal portions of both gases, both Will be under equal pressure.

As Will be seen from the description and drawings, the attendance required by the apparatus is extremely simple. The operator can easily control at a glance the adjustment as to quantity and mixing proportion.

The novel feature in the effect or action lies in the fact that, in comparison with the usual throttle devices, and the attendant tedious and complicated calculation of the quantities, a direct regulation is now possible according to divisions or graduations and, moreover, within Wide limits. For use in treating patients, however, with their differing cases, only such devices are Suitable Which, as far as possible, are capable of rapid, perfect and reliable manipulation.

I claim:

In a gas-administering apparatus of the character described, the combination of separate sources of gas supply, a pressure re-` ducing valve for each source of gas supply, each valve having a regulating screw and a gauge, a valve common to said sources of supply, said valve comprising a pair of relatively movable members, one of said members having inlet .ports each connected with one of the said pressure reducing valves and outlet ports connected, respectively, With said inlet ports, the other member having a collecting and mixing chamber provided with a delivery-neck and With apertures of varying width in opposite direction movable into and out of register with the outlet ports of the first-named member for simultaneously and similarly regulating the flow of gases through said outlet ports, and a respiratory mask connected to the said delivery-neck.

HANS WILHELM CHRISTIAN SCHRDER. 

